From 2d21d50c10d1041f56d6f089d66a98b2bbf55e12 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Tue, 13 Jan 2009 09:08:32 +0000
Subject: [PATCH] Issue 4922: Incorrect comments for MutableSet.add() and
 MutableSet.discard().

Needs to be backported to 2.6 and forward ported to 3.0 and 3.1.
---
 Lib/_abcoll.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Lib/_abcoll.py b/Lib/_abcoll.py
index a5fee081df5..38b44a58950 100644
--- a/Lib/_abcoll.py
+++ b/Lib/_abcoll.py
@@ -249,12 +249,12 @@ class MutableSet(Set):
 
     @abstractmethod
     def add(self, value):
-        """Return True if it was added, False if already there."""
+        """Add an element."""
         raise NotImplementedError
 
     @abstractmethod
     def discard(self, value):
-        """Return True if it was deleted, False if not there."""
+        """Remove an element.  Do not raise an exception if absent."""
         raise NotImplementedError
 
     def remove(self, value):